Chain-stitch sewing-machine.



PATEIITIEZD JULY 28, 1903.

c. G. KRAMER. CHAIN STITCH SEWING MACHINE.

APPLICATION FILED MAY 6, 1899- IO MOBIL.- 2 SHEETS-SHEET 1- WW O PATENTED JULY. 2::

0. G.- KRAMER. GHAIN STITCH SEWINGMAGHINE.

APPLIOATION'FILED MAY 6, 1899.

2 SHEETBSHEET 2.

E0 MODEL.

UNITE STATES PORATION OF ILLINOIS.

Patented Jui 'as, 190s.

[PATENT OFFICE.

ILLINOIS, esrenon TO THE UNION ANY, OF CHICAGO, ILLINOIS, A COR- CHAIN-STITCH sis'w'lNoiviAcl-imsa SPECIFICATION forming part of. Letters Patent No. 734,574, dated July 28, 1903.

Application filed May 6, 1899- Serial No. 715,328; (No model.)

nois, have invented certain new and useful Improvements in Sewing-Machines, of. which the following is a description, reference being had to the accompanying drawings and to the letters of reference marked thereon.

My invention relates to an improvement in sewing-machines, and more especially to a sewing-machine of thedouble-chain -stitch type provided with a laterally-vibrating needle making a zigzagor overseaming stitch. The object of the invention is to provide a machine in which a double chain-stitch is made upon each throw of the needle.

In the ordinary laterally-vibrating-needle machine, in which the zigzag needle cooperzo ates with the looper, as usually constructed,

' upon the under side of the fabric on one side of the seam is a single chain-stitch, while at the other side of the seam is a double chainstitch, thus making a ridge on said under side and a seam which is not readily drawn up in the goods, a feature which is objectionable on some kinds of Work, particularly, leather-work. In this character of work it is desirable that the stitch should be drawn up 0 into the goods and that the stitch should be as nearly alike on both sides of the fabric as is possible. These objects are accomplished by me in combining with the laterally-vibrat ing needle and-a looper which. cooperates therewith a loop retainer or detainer, which acts to hold the needle loop around the looper and back on the same while the looper is moving forward, by this arrangement making a double chainstitch on each throw of the needle and also preventing the needle in its downward movement from interfering with its own thread aroundthe looper. v

The invention therefore consists in the matters hereinafter described, and referred to in 5 the appended claims.

The invention is illustrated in the accompanying drawings, in which- Figure l is a side elevation of a sewingmachine embodying my invention. Fig. 2 is 5o a plan view, the bed-plate and upper portion of the machine being removed. Fig. 3 represents a perspective view of the needle, looper, and loop-retainer in the positions occu pied by them as the needle is at its lowest point and the looper is about to move forward in position to catch a loop of needlethread. Fig. 4 isasimilar view representing the same parts at the opposite extremes of their movement. Fig. 5 is a similar" view of the same parts as the looper is moving back to its first position and the needle is on its downward course. Fig. 6 ma top plan view showing the stitch made on this machine, and' v Fig. 7 is a bottom plan view of the stitch.

In the drawings, A represents the bedplate; B, the gooseneck; C, the needle-lever, and D the oscillating needle-bar-carrying gate or frame of the ordinary Union Special zigzag or overseaming machine stitch, this I gate or frame D being oscillated to impart the lateral movementto the needle-bar a by the ordinary pitman and cam-and-gear connections with the driving-shaft E.

' F represents the. looper supported on the ordinary looper-rocker carried on the oscillating bar or frame G, driven from the main shaft of the machine by easy fork-and-cam connection, said looper being oscillated to give the loop-taking and loop-leaving movements by means of the pitman connection 0 with the lower end of the needle-lever of the machine.

Adjacent the feed-dog-operating cam and 1 upon the main shaft ofthe machine is a cam H, which actuates an upright block I, fixed at its lower end around a rock-shaft d, pivoted in lugs e on the bed of the machine. This upright I is provided with an inwardlyextending part f, forming one side of a fork, between which fork and a cut-out portionof 9c the upright the cam H is embraced.- Attached to the upper end of: this arm I- isattached by a screw a block g, having anopening through which is passed the shank o f a loop-retainer K by means of screws h. This loop retainer is preferably of the shape shown-11. ,e., with an upwardly-curved part '6, extending toward the front of the machine and then curved back on itself toward the rear of the machine, as shown at 7a, forming Ioo a hook. The looper F is provided with a notch Z, into which when the looper reaches its extreme forward movement the needleloop slips.

In the operation of the machine and referring first to Figs. 3, 4, and 5, and when, as shown in Fig. 3, the looper is at its extreme backward position and the needle at the limit of its downstroke and the point of the loopretainer K close to the needle, the machine being started the looper moves into the needle-loop, carrying a' loop of its own thread into said needle-loop, the needle begins to rise, and the loop-retainer moves toward the front of the machine until such time as the looper has taken the needle-loop, when there is a dwell in the movement of the loopdetainer, and it stays in one position while the needle is rising to the extreme limit of its upward stroke and the looper is moving to the extreme limit of its forward stroke, at which time the needle-loop slips into the notch Z at the rear of the looper. As the needle swings across the line of feed to come down in its other position the looper begins to move backward and the loop-retainer to move in a direction across the path of the looper, bringing the parts to the position shown in Fig. 5, in which the point of the loop-detainer has passed into the plane of the looper and holds back the needle-loop on the looper, preventing the same from slipping off said looper until such time as the needle has passed down through the goods and all danger of the needle interfering with its own loop has been avoided.

In a high-speed machine, and particularly in a chain-stitch zigzag or overseaming machine, I have found this invention of great utility, as all danger of cutting oi the needlethread by the needle is avoided and I am enabled to make a double chain-stitch upon each throw of the needle instead of, as is usually the case in double chain-stitch zigzag machines, making a single chain-stitch at one throw of the needle and a double chain-stitch at the other throw.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-- 1. In a sewing-machine, the combination with mechanism for making a zigzag or irregular stitch, and including a laterally-vibrat ing needle, and a looper cooperating therewith to form stitches, a movable loop-retaim ing device having movement into and out of engagement with the needle-loop for holding the needle-loop back on the looper, whereby a double chain-stitch is formed on each throw of the needle; substantially as described.

2. In a sewing machine, in combination with a feeding mechanism, a Vertically-reciprocating and laterally vibrating needle, a looper arranged to travel at right angles to the line of feed and cooperating with said needle to form stitches, and a movable loop-retaining device movable back and forth across the plane of movement of the looper for holding the needle-loop back on the looper,whereby a double chain-stitch is formed on each throw of the needle; substantially as described.

3. In a sewingmachine, in combination with a vertically-reciprocating and laterallyvibrating needle and a looper cooperating therewith to form stitches, a loop-retainer having an oscillatory movement back and forth, across the plane of movement of the looper, and timed to move into engagement with the needle-loop,while the latter is around the heel of the looper, and to hold the needleloop thereon until the needle has passed down below the plane of the looper, and the latter has nearly reached the limit of its downward movement, whereby a double chain-stitch is formed on each throw of the needle; substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES G. KRAMER.

Witnesses:

CHESTER MONEIL, ANNA S. KATz. 

